/*
 *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package com.zzrblog.appwebrtc;

import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.File;
import java.io.IOException;
import org.webrtc.PeerConnection;

public class RtcEventLog {
    private static final String TAG = "RtcEventLog";
    private static final int OUTPUT_FILE_MAX_BYTES = 10_000_000;
    private final PeerConnection peerConnection;
    private RtcEventLogState state = RtcEventLogState.INACTIVE;

    enum RtcEventLogState {
        INACTIVE,
        STARTED,
        STOPPED,
    }

    public RtcEventLog(PeerConnection peerConnection) {
        if (peerConnection == null) {
            throw new NullPointerException("The peer connection is null.");
        }
        this.peerConnection = peerConnection;
    }

    public void start(final File outputFile) {
        if (state == RtcEventLogState.STARTED) {
            Log.e(TAG, "RtcEventLog has already started.");
            return;
        }
        final ParcelFileDescriptor fileDescriptor;
        try {
            fileDescriptor = ParcelFileDescriptor.open(outputFile,
              ParcelFileDescriptor.MODE_READ_WRITE | ParcelFileDescriptor.MODE_CREATE
                  | ParcelFileDescriptor.MODE_TRUNCATE);
        } catch (IOException e) {
            Log.e(TAG, "Failed to create a new file", e);
            return;
        }
        // Passes ownership of the file to WebRTC.
        boolean success =
            peerConnection.startRtcEventLog(fileDescriptor.detachFd(), OUTPUT_FILE_MAX_BYTES);
        if (!success) {
            Log.e(TAG, "Failed to start RTC event log.");
            return;
        }
        state = RtcEventLogState.STARTED;
        Log.d(TAG, "RtcEventLog started.");
    }

    public void stop() {
        if (state != RtcEventLogState.STARTED) {
            Log.e(TAG, "RtcEventLog was not started.");
            return;
        }
        peerConnection.stopRtcEventLog();
        state = RtcEventLogState.STOPPED;
        Log.d(TAG, "RtcEventLog stopped.");
    }
}
